poly·un·sat·u·rat·ed adj \ˌpäl-ē-ˌən-ˈsach-ə-ˌrāt-əd\
of an oil, fat, or fatty acid : having in each molecule many chemical bonds in which two or three pairs of electrons are shared by two atoms—compare monounsaturated
Seen & Heard
What made you want to look up polyunsaturated? Please tell us where you read or heard it (including the quote, if possible).